REV01524

• Permit No: C1981071
• IBM Index Class Name: Revision
• Doc Date: 7/11/1986
• Doc Name: Preliminary Adequacy Letter -with written notes
• From: MLRD
• To: Colordao Yampa Coal Company
• Type & Sequence: PR1
• Media Type: D
• Archive: No

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The objective of Rule 2.04.6(1)(b)(i)(D) is to identify potential acid
forming, toxic-forming or alkaline producing materials. We are
e a specifically interested in discrete areas and geologic strata in which
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' these materials may exist. Table 7 presents only average and maximum
~A '^ and minimum values. Actual sample data by stratum is necessary.
.)y;,~ Please provide overburden analyses for the following formations: marine
~/as ~ shale; the fine-grained discontinuous sandstone; the Lennox coal seam;
~a.~_``e~~ the Wadge overburden; the Wadge stringers; roof and floor samples from
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intersects these formations. All lithologic units should be sampled in
accordance with Montana or Wyoming DEQ's overburden sampling
guidelines. Maximum values from Table 7 suggest that there could
potentially be problems related to pH, EC, SAR, nitrogen species, lead
and molybdenum, and consequently, we request this detailed
information. In providing us with additional information, please
document the units for each parameter listed and the analysis method.
Were nickel analyses determined by DTPA or acid extraction?
Hydro logy Description - Rule 2.04.7(1) ;~: ~~,)~~
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~, ~ ~ Throughout the narrative, Wadge; water quality was described as having
;4i ,,.LDS_lexele of roxi tely 600 mg/1, white Exhibit 10 showed it had
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TDS Levels of approximate) 900 mg/1, whi 1 e
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Exhibit 10 showed it had levels averagin 500 mg/1. Please correct the ~
narrative. iZu. ~'~~ ~u'~- r~'° ` `
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Rule 2.04.7(3) requests information.,on specific users of water in the
~ ground water and surface water basin: Please provide a table which
categorizes users (domestic stockwatering, irrigation, mining) and the
~f~equency and quantity of water utilized by these consumers.
~, ; ;'/3. Please submit a table indicating CYCC's adjudication rights for both
-',`'`., ground and surface waters. (Rule 2.04.7(3)). Document the presence of
- ~~ these rights during baseflow nditions tir~-frequ ncy of calls by
~- downstream users and the ater qua i y of these right Please present
----------a-sehedule~a"nd~pran which documen hts-which will be used under
~' different scenarios, to enable us to assess the impact of this use to
~' the hydrologic regime.
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Rule 2.04.7(4) requires the elevations and locations of water
monitoring stations. Please label the elevations of all water
monitoring sites (surface and ground water) from Table A, Exhibit 2i on
Map 17. Also, it will be necessary for all water monitoring sites
identified in Exhibit 21 to be located on the map.
Page 2.04-26 states that the permeability of the Wolf Creek overburden
is an order of magnitude less than the Wadge. H_ ave_pump~ shown
thi s to be true? ~Wha-t--i-s--tFre permeab`i T i ty of~he~Wo1 f Creek coa .
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